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magnetos are on the top and end of the engine close to the air intake on upper fuselage. "Heavy rain"? Hard enough to blow into that intake and get those electricals wet? They don't like water...
to start: spark, fuel, compression (and I'll add rotation speed).
Water in tank? be sure none. Shake the wing. Scupper drains at fuel filler are notorious for getting plugged, water pools and goes into tank. Once I wasted a month trying to start a jaguar that had horizontal fuel filler in a well on top fender by trunk lid. Looked at everything checking out ok. Turned out drain had stopped up and a heavy rain caused alot of water to get in the tank and fuel pump was sucking up water in the bottom with start attempts rather than fuel.
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